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9-Sheets'8heet 1." LOOP, FORMING MECHANISM FOR SHOE SEWING MAGHINES. No.524,338. Patented Aug. 14, 1894.

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LOOP FORMING MBOHANISM FOR SHOE SEWING MAGHINES. No. 524,338. PatentedAug. 14, 1894.

(No Model)" 9 Sheets- -Sheet a.

F. A. MILLS.

L001? FORMING-MECHANISM FOR SHOE SEWING MACHINES. No. 524,338. PatentedAug. 14, 1894.

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P, A. MILLS. L00]? FORMING MBGHANISM FOR SHOE SEWING MACHINES.

No. 524,338. Patented Aug. 14, 1894.

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LOOP FORMING MECHANISM, FOR SHOE SEWING MAUHINBS. No. 524,338.

Patented Aug; 14, 1894 THE "cams PETERS co. PMo-ro-uwoq wxsmnaron. a.'c.

" nu Model) 9 Sheets-Sheet 6.

I 4 F. A MILLS. "LOOP FORMING MECHANISM FOR SHOE SEWINGMAGHINES.

No. 524,338. Patented Aug. 14, 1894.

9 Sheets-Sheet 7.

(No Model.)

- P, A. MILLS. LOOP FORMING MECHANISM FOR SHOE SEWING MAGHINES.

No'. 524,338. Patented Aug. 14, I894.

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F. A. M: LOOP FORMING MECHANISM F0 'No. 524,338.

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- F. A. MILLS; LOOP FORMING MECHANISM FOR SHOE SEWING MACHINES. No.524,338. Pafcented Aug; 14, 1894.

m: NORRIS PETERS o0, rumauwa. WASNIHGTON. n c.

FRANCIS ARTHUR MILLS,

on PHILADELPHIA, PENNSYLVANIA, ASSIGNOR,

BY MESNE ASSIGNMENTS, OF ONE-HALF TO JAMES MUNDELL, OF SAME PLACE.

LOOP-FORMINGMECHANISM FOR SHOE-SEWING MACHINES,

SPECIFICATION forming part of Letters Patent No. 524,338, dated August14, 18 94.

Application filed January 28, 1893. Renewed November 20, 1893. SerialNo. 491.442- (N'o model.)

A To all whom it may concern.-

- cifically set forth in Be it known that I, FRANCIS ARTHUR MILLS, acitizen of the United States, and a resident of the city ofPhiladelphia,

operates with a waxed thread; and my said improvements consist incertain novel parts and combinationsof parts hereinafter spethe claimsconcluding this specification- Before specifying such claims I willdescribe the machine illustrated in the drawings.

The following description read in connection with the drawings, willenable any one skilled in the art to-which my-invention relates tounderstand its nature and to practice it in the form inwhich I prefer toemploy it; but it will be understood that my invention is not limited tothe precise form herein illustrated and described, as variousmodifications may be made without departing fromtits spirit and withoutexceeding the scope of the concluding claims.

Referring to the drawings: Figure l represents a vertical centralsection of a shoe sewing machine embodying my invention, the needlebeing shown in the position it occupies in its full, outward movement,and the supporting devices locked in position to sup,-

- port the Work as the loop is pulled and the 50 shows theneedle-carrier in side view. Fig.

stitch set. Fig. 2 is an elevation of the right side of the same. Fig. 3is an elevation of the left side of the machine. Fig. 4 is a front viewof the same. Fig. 5 is a rear view of the same. Fig. 6 is a top View ofthe same. Fig. 7 is an axial section of the separate cam cylinders andshowing their connection by the pitman-rod operating crank-pin fortheneedle-carrier. Fig. 8 shows an enlarged vertical section of thecenterhead structure, the several devices contained therein occupyingthe position shown in Fig. 1. Fig. 9 (Sheet 1) in the county of,Philadelphia and State of Pennsylvania, have useful Improve- .device forthe slide-rest.

10 is a front view of the same; and Fig. ll'a top View of the same,showing the end of its operating pitman-rod and the cheeks for the pivotbearingt-hereof. Fig. 12 (Sheet 6) shows in perspective a portion of thesewing-head and the work supporting, looper and feeding devices thereof.Fig. 13 shows the feed-lever arm in its relation to the shoe channel,illustrating in dotted lines the oblique movements of the feed-lip. Fig.14 shows'thefeed-lever and its operating cam. Fig. 15 shows the compoundfeed-lever device. Fig. 16 is a sectional view of the pivot-bearing ofthe feed-leverdevice. Fig. 17 shows the sewing-head structure divestedof its operating devices. Fig. 18 shows the bifurcated front. pillar ofthe conterhead wherein the sewing-head is secured. Fig. 19 is a sideview of the back-gage device. Fig. 20 is a vertical section of thedevice for operating the back gage. Fig. 21 shows the sliderest. Fig. 22shows in elevation the locking Fig. 23 illustrates the operation of thelooper around the needle to form the loop and place the thread in thebarb. Fig. 24 shows the threa'das it is placed in the needle-barb in theoperation of forming the loop stitch. Fig. 25shows the centerheadstructure in elevation, the looper and the slide-rest devicestherein. VFig. 26 shows in top view the trunnion-rollson thelooperrod and theirrelation with the cams which give the looper-rod an inward movement.

Fig. 27 shows circumferential cams for the topfeed-lever developed inprofile. Fig. 28 shows the face cam developed in profile, for operatingthe looper and roll-arm. Fig. 29 shows the cams for operating thelooper.Fig. 30 shows the screw-box for fastening the looper-rod spring tothesewing-head, asseen in Figs. 1

and 8. I I r The machine may be. mounted upon any suitable supportingstructure or standard in position for the presentation and manipulationof the work to the sewing, supporting and feeding devices. The structurewhich contains the sewing, work supporting and-feeding devices,comprises a horizontal base-plate 1,'a centerhead mounted thereon atright angl'es andforming a front and rear pillar 3 and 3' connected by asemi-circular wall 4 making an inverted arch open at its base or top andat each side for the accommodation of separate cylinders having cams foroperating the sewing and work supporting mechanism and for thearrangement of the crank connected pitman rod for operating theneedle-carrier,

the crank pin whereof unites the said-cam-v ..head, whereby thecenterhead can be ad justed in relation to the crank operating-pin ofthe needle-carrier,- to give theneedle more.

orleSsfrOnt-Ward positionwithrespect to the looperto givethe-properrelation of the needles barb thereto. The front pillar 3 ofthecenterhead has a rectangular vertical opening 10:Fig. 1 8 open at thetop within which is mounted the sewing-head,which, for this purposehasvertical coincident recesses 11, 11 on each side, fittingcorresponding tongues 12,12, on theinne-r walls of the opening 10 in thecenterhead,=and when seated in place-within the .latteris securedby-screw bolts 13 passing through the vertical-sides of-the centerheadand into threaded holes 14. in the sides ofthe sewing-head. Thissewing-head is constructed of verticalside plates 15, secured togetherso as to leave an intervening spaceby a front plate lfixand atop plate17; fastened together by-across screw'18. The right vertical side plateisarohed atits-lower front corner to leave 4 an open-space 15, Figs. 17and 25,within which carrier. is formed oftwo matching plates 21 21, 10the inner side wall of-one of which the curved needle 22. is clamped byacap 23, so

the-acti-ngend 19 of the-feed-lever works at the-side of thehead, Figs.2, 12 and17, and which-opening allows access tothe needle-- carrier.In-the other vertical side plate the --ne'edle-. carrier islooselymounted upon a horizontal rocking pin 20, Fig. 10 (Sheet 1). This as textend to thefront from the lower side f, the -ri rg which latter isarranged to op-. erate, between the sewing-head plates at the archedopening 15 atthe sidethereof, as seen in Figs. 21and 12.

Above the needle-carrier, th rod 24 which carries the looper 25 passes;throughand has a bushed bearing- 92 inthe. front face of thesewing-head. Above this looper rod at the right side of the sewing-head;is mounted the actuating lever 26 of the feed device; whileback of andbelow the needlecarrier the back-gage 39 is fitted within the slottedbottom of -the sewing-head, see Fig. 20. I make the needle-carrierof twoplates to obtain a convenient construction for the mount. ing of theneedle-guide between them upon thepivot-pin20 of said carrier, uponwhich said needle-guide is fixed, while the needle carrier is looselymounted on said pin so that the carrier and the needle-guide willoperate together and also independently of each other. For this purposethere is a space between the pivot bearing ends of the matching plates21 21, to, receive the eyed'end 29. of. the. needle guide-arm 28, whichis pinned to-the pivot by a pin 30, Figs. 9, 10 and 12, which projectsso as to be struck by the needle-carrier when the top of the lattermoves forward to give an inward movement to the needle-guide to followthe needle back in the function of bracing and guiding it.

For keeping the needle-guide in the proper relation to thebarb of theneedle, I fix an arm 31, Figs. 3 and 10, on the other end of the pivotpin 20 of the needle-carrier and connect said arm to a spring321whichconstantly tends to pull it-back and the needle-guide forward,

so that as the carrier moves forward the guidearm-will be free tomoveforward withit. The stoppins '33; Fig. 3, on the outerwall of the leftplate of the sewing-head act to limit the movement of the arm 31 and theneedle-guide in proper relation to the b'arb'of theneedle. Theneedle-carrier has cheeks 34,'Figs. 8, 9

and 10, between which the crank operated pitman 35 is connected-by thepin 36. ifThese cheeks arefitted to move-closelybetween the inner wallsof the side plates 15 ofthe sew ing-head and the latter thereby serve asguides for supporting the upper end of ,the needle-- carrier-to preventsidewise looseness in its motion, prevent undue strain upon the pivot 20of the said needle-carrier, and give a firm movement to the needle inpiercing the work.

These cheeks also give a firm sidewise support to the-connectingpitman-rod and-cause it to have a direct central pull in the line of theneedlegwhile the crank-pin connected end 1 of the pitman is firmlysupported. sidewise between hubs 37, Fig. 7, of cam-cylinders towhichthe crank-pin is fastened. Thisconstruction gives a direct, firmand easymovement to the pitman-rod and to theneedlecarrier, renders themdurable, easilyput in place, and allows a renewal of the carrierpivot20by a bushing 38, Figs. 17 and 25 fitted in the-sewin'g-head.

Forsupporting the'edge of. the sole. at the point of stitching andclear'ofthepointof the needle when feeding the work, Iprovidea back-gage39 Figs. 8,319. and 20,.car-

ried by theslide 27 dovetailedin the bottom plate of the sewing-head.The back gage is driven forward bya cam 40, Figs. 3, 4.. and 6, inposition to support the edge'of the sole just before the needle movesforward to pierce the work. The slide 27 is slotted and is looselyconnected by an arm 41, Figs. 8, 19 and 20standing up from a crosspin42'havinga longsolid bearingin the centerhead and having an arm 43 onits outer end at the left side ofthe centerhead provided with a frictionroll 44:, which is actuated by the cam 40 to'effect the, positiveforward movement and locking of the back-gage. The inward movementof'the back-gage is efiected by a spring or springs 45 connecting theslide and the centerhead. This positive forwardmovement of the backgageis important because it serves to lock the gage when somoved so that theupper of the work can be held firmly against the shoulder of the soleand the tension of the thread does not have to pull the upper againstthe shoulder. In. sewing machines of this type so far as I know and canfind, this looking function of the back-gage has been effected by theuncertain action of a spring such unc'ertainty'being due to the nonpositive force ofthe spring and the quick action of the needle, which isthereby constantly liable to move in advance of the back-gage. When thisoccurs the needle will pierce too low into the upper to allow the latterto be drawn to the shoulder of the sole and this draws the upper in theshanks of the shoe so as to preventa smooth setting and makes the shanksmore or less irregular because it requires a much greater tension of thethread in drawing the upper in the opposite side. Whereas by giving theback-gage a positive forward movement and a firm look when so moved, italways puts the upper to its place before the needle pierces the upper,and hence the tension is made uniform and there is no unequal drawing ofthe upper at the shanks. This is particularly advantageous in sewingwelted shoes. I provide for adjusting the back-gage so as to limit itsdistance from the feed-lip to suit the thickness of the material betweenthe bottom of the channel and the edge of the sole, and for giving asuitable clearance for the feed of the shoe, between the feed-device andthe back-gagewhen the shoe is being fed. This adjustment is made bysetting the cam actuated arm 43, so that it will act to carry the backgage more or less forwardand this is attained by a clam p-screw 45, Fig.19, passing through a split in the bearing end of said arm 43, so thatthe latter can be clamped on the cross pin 42 which actuates the slide27. The slide connected arm 41, Fig. 20, is screwed upon the pivot-pin42 against a shoulder which makes a convenient joining in the solidmetal of the cen terhead, which has a deep recess to receive the arm 41and through which recess said pin passes.

For supporting the lasted shoe in proper position to the sewingmechanism, I provide a slide-rest arranged below the back-gage andcooperating with it. Its acting end 46 stands vertically with a convexouter face just under the acting end of the back-gage, and curvingdownward and rearward terminates in a flat bar 47, Figs. 1, 8 and2l,which is fitted to slide horizontally in guide w'ays 48 48, in thefrontand in the rear pillars of the centerhead, and in line with theline of movement of the needle-guide, so that the line of pressure uponit is direct. Its front guide way is preferably of an inverted T-shape,while the guide way for its inner d is formed in a box 48 fixed in thecenterhead and open at itse nds and top. A friction clamp block 49 isfitted to block is held in position upon the slide-rest I by apressure-lever 50 pivoted to the rear side of the centerhead at one sideof the box, and crossingover the friction-block, engages a cross-grooveFigs. 1, 8 and 22 therein. so as to prevent the block moving withtheslide-rest. The other end of this pressure-lever extends beyondtheleft side of the centerhead and is constantly forced down by a spring51 connected to the center-head and adjusted to give the proper degreeof pressure upon the lever 50 necessary to bind and lock the slide-rest.This adjustment is made by a tension screw 52, Fig. 3, fitted in a fixedlug 53 at the top of the spring. To release the lock'on the sliderest Iprovide a lever 54 pivoted at 55 to the left side of the centerhead at apointjust at one side of and below the free end of the pressure-lever.This lever 54 extends front ward and has afriction roll 56 which engagesa side face-cam 57, which is formed to both look and release theslide-rest lever 50, as I shall presently state. The arrangement of thepivot 55 of this cam actuated lever 54 places the short end of saidlever just under the free end of the pressure-lever 50, so as tolift'the latter by a screw 58 in the short end on said cam actuatedlever, abutting against the under side of the free end of the pressure-lver andthus when lifting the latter release th pressure of thefriction-block 49 on the sliderest and leave it free to be pushed backwith I the work. This screw 58 has a jam'nut59 by which the bearingrelation of the meetina ends of the two levers 50 and 54 can b d? justed to constantly maintain the contact of the pressure-lever upon thecam-lever and the latter in contact with its actuating cam 57, andthusprevent lost motion. The guid box 48 is fitted and secured in arecess in the centerhead and the slide-rest is constantl y f pressedforward by a spring 60, Figs. 1, 8 and 21, which allows it to yield whenthe shoe is being fed. The outward movementof the slide-rest is limitedbya pin 61 therein abut- .ting against the inner wall of the centerhead.

The'compound lever device for locking th slide-rest is such as to allowthe cam actuated. lever 54 to be constantly en gaged' with it m andindependent of the locking function f the pressure-lever. This allowsthe latter to.

be lifted by a free and easy movement of the cam-lever, because thelatterhas a very short lifting leverage and acts upon the free end ofthe pressure-lever in vertical line with'the tension spri levers andspring gives the advantage of pla ing the friction-block near the pivotendpf This arrangement of the said I the pressure-lever, and thusobtaining great pressure bya comparatively light-spring.

The device for feeding the shoe as seen in Figs. 2, 13,14, 15, 'and'16,consists of a lever-26 of approximately L-shape pivoted to the rightside of the sewing-head-at its-top and carrying at its lower-end an arm19'which terminates in alip a standing toward the machine and adaptedtoenter the channelof the sole. The upper end of this lever has africtionroll 62 which is held down upon a circumferential cam-63' ofacam-cylinder bya spring 64, Figs.

2 and14 connected-to the centerhead. The pivot bearing of. this lever isfixed toit, is of considerable diameter'and is fitted ina-suitablebushedbearing 65, Figs. 8 and 17-which is seated and securedbetween'and within rectangulardepressionszin thetop edge of the I side:plates of the sewing-head by the screw 18, which binds said platestogether and by the cap plate17on the other side of saidbox. Theintermittent rockingmotion of this feedleverimpartsoutwardand inwardmovements to'its feeding-orli'ppede'nd. Simultaneously with the outwardmovement the feed-lever hasgimparted to it a lateral or sidewise move-v.ment upon'its pivot-pin, which, forthat purpose slidesroutward initsbox, so that thetwo movements will describe azig-zag path or line 68like that of saw-teeth, as illustrated in: Figs-13. This oblique feed ofthe lip is outwardfrom the bottom of the channel toward ment which isindicated by the dotted lines 68,

date said rocking movement. The two arms ofthis lever 70 have each afriction roll 71" whichengage vertical-face cams 72 72, Figs 'theright.1 At the end of this oblique movethe inward movement of the feed lip iseffectedtocause it to engage the bottom of the channel 69 and' after,the stitch has been thoroughly. pulled,.th'e said lever is then causedto move back sidewise carrying its pivot-pin in its box, an'dthus movingthe feed lip to the left to feed the shoe for the next stitch. Foreffecting these .lateral movements of the feed-leverl provide amechanism which consists of ale ver' 70 pivoted to the top plate of thesewing- ,head in the rear of the lateral sliding pin of the feed-lever,and connected at its front end tosaid sliding pin,- by'a vertical pin71, Figs: Hand 16, which fits into a hole in said slid As this pin isfixed to the feed-lever and has a rocking motion with it this-holeising-pin.

,largerthan the vertical pin 71 to accommo- 6, 7, and 15, arranged onseparate cam-cylinders and which impart a horizontal vibratory .movementto said lever 70, which thereby gives a sidewise movement of thepivot-pin 74, in its box 66 to move the lever 26 sidewise as-stated.This compound movement of the feed-device is such that each completemovementofthe feed-lever and-its return movement. for the'next feed,describe an acute angle, the apex 73 of which is the point at which thefeed stroke terminates, as will be understood from Fig. 13. It is fromthis point .7 3 that the feed-lip describes its oblique path -cision inthe channel.

68 to the point atwhich the said lipstops to make the short inwardmovement from the point from which it describedthe-base line of a rightangled triangle. v

The provision of two rolls and two separate cams for operating the lever70which gives the lateral movements to the channel-lip aof thefeed-deviceis important for operating said lever without lost motion andthus keep 15 and '16, of thefeed-lever26 about-three inches longandseven-eighthsof.--an inch in diameter to give a sufficientbearingforthe firm seating of the lever, and itzmay be constructed withsteelbearing sleeves 74 fitted :on each end soasto be renewed when worn.

I may also provide this sliding pivot-pinwith a central boreintersecting the side hole which I receives the pin 71 of the toplever70 and I place in this bore steel bearing pins 75 and "76 on-eachside of the pin 71 of said top lever. 1 make one of these bearing pins75 in the form of a screw so-thatits adjustment against the said toplever pin 7l'will takeup any wear, and in this way the feed-lever can bemaintained cheaply in perfect working fit. The adjusting screw has a jamnut77 which binds the sleeve and the screw in place; while a nut 78 onthe other end of the-sliding pivotrod pin serves tofsecure thefeed-lever and bind the sleeve so that these two sleeves 74 form 'fixedpartsof the pivot-pin.

IIO

The fulcrum-pin 80' of the bifurcated lever 70 is screwed into the topplate of the sewinghead and has a hushed-bearing in the lever sothat itcan be replaced when necessary. See Fig. 8.

I will now describe the mechanism for placing the thread in the barb ofthe needle and forming the loop around it. It consists of a swinging arm25 mounted upon the front end of a horizontal rock-rod or tube 24t-whichpasses through the sewing-head between the cam-cylinders and through therear pillar of the centerhead so that it has bearings in thesewing-headland in the centerhead and within which it has both a rockingand a longitudinal movement as I will presently-state. At its front endthis rod projects from the sewing-head and has the swinging looper-armwhich at its lower end has the looper-finger 81 standing at a downwardincline toward the needle and when in-its normal position, is to theextreme left of the line of movement of I the needle, and the latter isat its extreme inward position, The upper end of the needlearm is splitand is clamped upon the said rod by screws 82. See Fig. 12. Thelooper-finger is cylindrical, is screwed into the arm and has a centralhole 83 which opens at its side 8st to receive and feed the thread. Theother end of this rock-rod 24 projects beyond and terminatesin ascrew-stem 24', Fig. 8, on

1 finger in relation to the needle.

which a sleeve 85 is fitted between jam-nuts 86 on the screw end and atrunnion-head 87 fitted loosely upon said rod and has frictionrolls 88which engage face cams 89 for forcing the looper inward. A spring 90 onthis rod constantly tends to force the looper frontward andthevprovision of the jam-nuts 86 is for adjusting said rod to properlyset the looper- In this adjustment the sleeve 85 abuts against thetrunnion-head 87 andas its rolls 88 constantly bear upon theirrespective cams 89, Figs. 6, S and 26, the jam-nuts therefore actingagainst thesleeve as a fixed point will set the looperfinger and renderthe rolls self adjusting on their cams under the action of thespring.

A hushed-bearing 91 is provided at the rear side of the centerheadforthis looper-rod and there is a similar bearing 92 for its front end sothat these hearings can be replaced when worn. and is clamped toit byascrew 94 while its lower end has a friction roll 95 which engages a ringcam 96 on the inner vertical face of the left cylinder 97, whereby saidarm is moved positively to move the rod and vibrate the looper-arm tothe right. The spring 90 has a fixed'connection with the rock-rod oritsroll-arm, its other end being screwed into a threaded-box 98, Fig-"$. 8,25 and 30, and clamped to the inner end of thesewing-head and itstorsional force causes the looper-arm to vibrate to' the left. The screwof the box engages the coils of the spring and holds it against thedirect force and torsional strain caused by the longitudinal and rockingmovements of the looperrod and prevents the spring from havingfrictional contactwith said rod, so that the conjoint action of thetrunnion-head cams 89, the roll-arm 9 6 and the rod spring 90 gives therequired revolving motion to the looperfinger. The provision foradjusting the looper-rod serves also to adjust the roll-arm 93 so thatit will not come .in contact with the crank connected end of thepitman-rod.

When the adjusting nuts 86 are turned to the left the spring sets therock-rod and its looper-arm forward, and when these nuts are turned tothe right the rock-rod and its looperarm are moved back. Thisconstruction and the action of the spring render the trunnion-rolls selfadjusting in the line of the rod and upon theircams, and take up anywear that may occur in the longitudinal movements of. the looper-rod 24or the side movements of the roll-arm 93. An important feature of thislooper-rod and its coiled spring is the capacity of the looper arm toyield While moving tothe left so that at any point An arm 93 dependsfrom the rock-rod in i ts movement to the left the looper-arm islooper-arm and permits it to be'arrested and to yield in the contingencystated.

The provision whichI have described for adjusting the looper-rod isimportant to keep the looper-finger in position todescribe the circle ofwhich the needle will always be the center, because the tendency of thewear is always to allow the looper-rod to work forward under the forceof the spring, which,

without being compensated for, would in time cause the looper-finger tostrike the needle.

Referring to the cam actuated rolls 88 on the rock-rod for giving thelooper its out and in movement's, I fit these rolls loosely on trunnionsof the cross-head and hold them-in place by shoulders formed by the cams72. a See Figs. 6, 7 and 26 on the cam-cylinders. This allows the rollsto be removed for replacement bynew ones by pushing the rock-rod back toclear the rolls of the cam-shoulders.

I have stated that the looper nose is caused to describe a circle aroundthe point of the needle having its barb on the left. In explanation ofthis I mean that the looper finger or nose makes this circle by acontinuous circular movement in which the looper finger in its frontwardmovement, starting from the left of the needle, moves both to the rightand to the left. And in its rearward movement the looper continues totheleft and then to the right and then back to the; leftat the, point fromwhich it started, making a movement in three directions as the looper ismovin frontward and three as it is oin b 2 b b backward. This so far asI know and can findis new in forming a loop and placing the threadaround a barbed needle.

As stated the needle-carrier is operated by a direct cam motion whereinthe crank is mounted in separate cam-cylinders. These cam cylinders 97and 99, Fig. 7, are each fixed upon a separate shaft 100 which aremounted in separate standards 1 101 on the base-plate of the centerhead.The cam-cylinders are separated to permit of the rotary crank movementof the -pitman-rod between them, and

for access to the cams and mechanism when necessary. The separatecam-cylinders each have a ring cam on its outer side andon itscircumference and'the left of said cylinders 97 has an inner side facecam as I will presently describe; These cam cylinders are united to eachother by the crank-pin 103 of the pitman-rod which pinhas a screw threadon each end to receive countersunk nuts 104 on the outer sides of saidcam-cylinders. The crank-pin is also keyed to the cylinders by means ofscrew pins 0 0; while the cam-cylinders are keyed to their respectiveshafts by means of key-pins d d. and screws 6 e which t the belt-wheel.

serve to hold the cam-cylinders fast on their respective shafts so thatthey can neither turn on nor slide off their shafts. A sleevef on thiscrank-pin forms a bush-bearing for the 'pitman-rod and the sleeve endsabut against the inner hnbbed sides 37 of said on the base-plate and aresecured and made ad ustable by clamp screws h so as to brinlgthecam-cylinders in equal relation to the on -posite sides of thecenterhead. lnlconnection with this lateral adjustment of thecanicylinders I provide for adjusting the centerliead-atright angles to,the line of shafts by the slot 9 in the base-plate'andthe screw bolt 8,Fig. 1, which secures the centerhead -thereto. The object ofthis'adjustment is to:

set thecenterhead so that the needle shall have the proper relation tothelooper, and

connection with the side adjustment of tlie cam-cylinders, give all theworking parts perfectcentral relation to each other.

sHav'ing described the construction anii function of the severaloperating devices in the organized machine I will now describe :themeans by which these devices are separately and conjointly operated.

As the needle-carrier is operated by its pitman-rod connection to movethe needle for ward, the back-gage is at the same time moved forward alittle in advanceof the needle in:

position to press theedge of the shoe upper against. the shoulder of thesole to hold them together while pulling thefistitches. This movement oftheback-gage is. effected by a circumferential ring cam 40, Figs. 3, 6and 7,

which has afi-attened surface i of about onefifth of the circumference,so that while this -fiatten'ed part serves where it merges into thecircumference of the ring, to cause the back gage to be moved, in andout at the proper time, the concentric part 40 of said cam acts to lockan-d to hold the roll arm 43 anditscon- -nected back-gage 39 in itssupporting position'while the stitch is being pulled in tightly. I alsomake this cam 40 to gradually merge into the true circle-at 2' 2'? tocause it to give a' gradual forward movement to the backgage just beforeit comes in contact with the work and thus prevent all knocking action'whichwould result from a sudden outward spring throwot the said gage,and jar the shoe forward so' that the feeding lip would be liable tocutthrough the bottom of the channel and destroy the sole.

Referring to Figs. 1 and 8, the back-gage,

the needle, the slide-rest and the looper are by the spring 60 attachedto the centerhead and to the inner end of the slide-rest, so as toconstantly tend to move the latter forward to keep the shoe firmlypressed against the feeddevice. When in this position the slide-rest islocked by the ring cam 57 on the outer side of the left cam-cylinder 97,which cam for about half its circumference is constructed at its lowestpart j, Fig. 3, to allow the pressurelever 50 to apply and maintainv thelook as stated, while a stitch is being drawn tight. The other half ofthis cam has a greater concentric radius 57 to act upon and depress theroll-end of the lever to raise and release the pressure-lever from thefriction-block 49 and thus allow the .free yielding action of theslide-rest to admit of the free-feedingof the shoe between it and thelip of the feed-lever. The lever of the feed-device ,ehastits compoundmovement effected as. follows: The

circumference of the right cylinder 9.9. has a slight depression 7c,Fig. 14, of about one-fifth of the same'which gives the inandoutmovements to the acting end 19,'o'fth'e feed-lever 26; while theremaining portion of -the cam circumference 63 serves to hold thefeed-lever lip a againstv the bottom of the channel in, the sole. A.vertical face-ringcam 72 on,1 each cylinder operates to vibrate the-Tshaped lever 70 to move the .feed-lever26, sidewise to .feed thershoebythe saw-tooth. shaped movement of the acting end of. the :feed-leverwhichl have described; The-,cam 72which gives. the movement to,feedlthe, shoe, is;- 0n the right-side cylinder 99 and has aicurvedsurface projection 72 Figs. 14,6 and'27-about one-seventh thecircumference of theycam and acts to move the feed-lever the extent ofthe feed; While the cam 72oni the left side of the cylinderi97 is. ofidentical construction and acts to move the feed-lever the, distance tomake the next. feed of the shoelj Itjwill be understood that assthefeed-lever 26 is vibrated sidewise its friction-roll 62 slides-on thesurfaceof the cam63ton antobliquetpath. I have planned allthecamtmoyements so as IIO not to exceed three-eighths of an inchvthrow,

which makes the machine easy; running and almost noiseless, not soliable to getout' of order, with comparatively little wear and havingquick-movements. Imake' these cams on rings to beveasilyseated, removedand replaced bynewones; whileithe, cylin- 'mechanism: The reciprocatingmovement is [looper finger 81 to be at the starting point is Fig. 23which is its starting point in relation 'to the needle, the looper willbe caused to de-' scribe a quarter-circle from k to Z by means of thecam 96 moving the roll-arm 93 sidewise and by the action of the spring90, moving the looper forward. From this point Z.

the looper continues to move to the front of the needle from l -to-m bythe action of the said spring, and continues moving-from m to 'n by theaction of said spring and cams 89 and so on from n to s by the action ofthe cams 89 and the cam 96, which completes the circle with respect tothe needle and places the thread in its barb u. The course of the looperis now changed from s to t which latter letter is in line with theneedle, and the looper remains in this position until the neodle reachesits extreme backward movement. At this point the slide-rest is unlockedand the back-gage is being drawn inward. The

feed device now starts to feed the shoe and at the same instant thelooper starts with the feedand traverses from t to is, which completesthe operation of the looping mechan-= ism. The path of the looper abovedescribed with reference to Fig. 23 can be read with same letters andfigures of reference in Figs. 28 and 29 in relation to the roll-arm 93.It will. be understood that in these compound movements of thelooper-rod, thespring 90 gives the looping device the forward movementto carry the looper outward, while the cams 89 act on the trunnion-rollsto draw it back positively. The rollarm 93 is actuated by the samespring at the same time by torsion to rock the rod and move the looperto the left; while the cam 96 serves to rockthe rod and move theroll-arm and looperpositively to the right. This construction it will beseen provides for actuating the looper in two directions by one springand a simple arrangement of cams upon separate cylinders for actuatingthe looper in two other directions, giving it an easy movement, providesfor wear and is practically composed of a compact device carried by asingle rod. The

placing of the thread in the barb u of the needle moving inward andwhile the looper is at the same time moving from the point n to sprevents mislooping of the thread by means of the joint action of thetwo movements of the looper and needle at the same time, the former fromthe left to the right and the needle inward. The object of having thelooper move to the left at the same instant the feed-device is movingtothe left is to prevent the feed-device from dragging or straining thethread as it iscarried by the looper,

and to permit ofa free and easy feed, because these two movements bringthe devices together at the point to make the feed at the same'time andwork together with a uniform, drawing action on the thread. The arm 19that carries the channel-lipis made adjustable vertically by means ofslotsand bolts seen in Figs. 12 and 13; the looper-arm can be adjustedupon its rod, by its split end and clamp screws; the back-gage can beadjusted by its operating arm 43, and the needle can be set in properrelation to the looper, so that these parts are easily and quickly setin working relation.

The tension device which-I have shown is I with a heavier thread as maybe required for the work. In doingthis the out part of the thread istied to the end of the new thread and the latter is drawn through themachine and the out part of the thread is thrown away. The time of theoperator is lost in passing the new thread into the machine and.adjusting the tension to suit the work. To save all this, trouble, lossof time and inconvenience, I provide the machine with tension devicesfor two separate and distinct threads suited for light'and for heavystock. For this purpose I use a tension device for each thread which isdelivered to the looper-arm, in the finger whereof they are held forseparate and in dependent use. The end of that thread which is not inuse is held out-of the way.

wax pot in order to join it with a lighter or at the upper end of thelooper-arm as seen in they may be of any suitable construction.

The machine is adapted for sewing turned ,or welted work and operateswith a curved needle which has a reciprocating or partial rotation toand fro around an axis, and it is formed with a barb on the side inthedirection of the feed, into which thelooper engages the thread indescribing a circlearound the needle.

It will be understood that a work table is placed around the stand belowthe sewinghead, and as the wax-potand tension devices are mounted uponthe swiveling member of the stand, such swiveling capacity affords access to these devices, which can thereby be brought around to the frontof, the table;

It is evident that immaterial'changes may I be-permitted from thegeneral construction and arrangement of parts contributing toward myinvention, and for'this reason I do not wish to be understood aslimiting myself in precise detail and construction. It will also beunderstood that many of the details above described are not essential tothe several features of my invention separately considered. This will beindicated in the concluding claims as in any given claim the'omission ofan element or the omission of reference to the particularfeatures oftheelements mentioned is intended to be a formal declaration of the factthat the omitted elements or features are not essential to theinvention'covered therei'nr I I have illustrated in the drawings theinvention claimed herein in connection with a completeshoe sewingmachine, but as to all matters of devices and of combinations of suchdevices embraced in said machine, other than those which belong to andare covered by the invention claimed herein, they are embodied inseparate-anddistinct applications, Serial Nos. 491,159, 491,160,490,965, 491,443, and 490,383 for Letters Patent filed by me, and aretherefore not claimed herein.

Having described a machine for sewingshoes embodying in preferred formthe several features of my present invention in loopseparately claim,and desire to secure by Letters Patent, is-

1.- In a sewing machine, the combination of a barbed needle andalo'oper-arm, with a spring connected and adapted by its torsional forceto maintain upon said arm a lateral pressure in one direction, and a camadapted to move said arm in the opposite direction, whereby saidlooper-arm is positivelyoperated in one direction sidewise, and is freetoyield in=the opposite direction in the event of strikingthe needle,substantially as described.

2'. The combination, with a barbed-needle, of a hanginglooper-arm,arock-rod therefor, and a coiled spring on said rod connected tomaintain thereon a force both of tension and of torsion, whereby tocushion the looper-arm in the event of its coming in contact with theneedle, and means for moving said rd,sub-

stantially as described.

3. 'Thecombinatiomwith a hanginglooper- ;arm a horizontal. rock-rod onwhich it is mounted a pair ofrolls mounted in a cross- .head looselyfitting on said rod, and a pendent roll-arm fixed on said rock-rod, ofcam cylinders engaging said rolls, a face-cam on one of said cylindersengaging said roll-arm,

-and a spring on said rock-rod connecting the latter with the fixed partof the machine, for operating the looper in the way and for the purposestated.

4; Thecombination, with a hanging looperarm, a horizontal rock-rod onwhich it is mounted having a pair of rolls mounted in a cross-headloosely'fittedon said rod and a pendent roll-arm fixed on said rock rod,of camsfor engaging said rolls, a spring on said formingmechanism incombination, what I rock-rod-connectingthe latter with a fixed part ofthe machine,-and meansfor-adjusting the looper-arm in and out inrelation to the needle,substantially as described.

5. .In a shoe sewing machine, av looper device comprising a horizontalrock-rod, an arm hanging from one end thereof terminating in alooper-finger, a spring coiled on said rod connected for rocking-itinone direction and for moving it forward, a pair of rolls carried by across-head loosely mounted on said rod, and a rollcarrying arm fixedupon and depending from said rod for rocking said rod in a directionopposite to that given to it by said spring, the said pair of rollsbeing operated to move said rod rearward, wherebysaid looper is causedto describe a circle around the needle, substantially as described.

6. The combination, in ashoe sewing machine of a horizontal rock-rodhav'inga hanging looper-arm at its front end, its other-end terminatingin a screw stem, a bearing-sleeve inclosing said screw-stem, aloosecross-head on said rod having a pair of rolls and abutting againstthe inner end of said sleeve, jamnuts abutting against the other endofsaid sleeve, aspring connecting said rod to a fixed part of the machine,a-pendent arm fixed 011 said rock-rod, andsuitable cams-for operatingsaid rolls and pendent arm, in the way and-for the purpose stated.

7. In a shoe sewing machine, the combination of the centerhead and thesewing headstructures, and an oscillating curved barbedneedle, with arod arranged above the needle in'fixed bearings at its front end in thesewing head, and at its rear end in the centerhead,

vice comprising a horizontal rod, a hanging looper arm laterallyadjustable on one end thereof, means on its otherend for adjusting itlongitudinally, and means for operating it,

substantially as described in combination with an oscillatingbarbed-needle mounted in the rear ofsaid looper-arm.

10. The combination, with the sewing-head and the centerhead, of a rodmounted horizontally in hearings in each and projecting from both ateach end, having a depending looper-arm fixed on its front end,-and adepend-ing arm fixed between its bearings, a

' spring coiled on said rod fixed thereto and to the sewing-head forforcing said rod outward and said arms sidewise in one direction, and

suitable mechanism for forcing said rod inward and said arm sidewise inthe opposite direction, substantially as described.

11. In a shoe sewing machine, the combination, with alooper-arm carriedby and depending from a horizontal rod, with mechanism for imparting tosaid rod both a longitudinal anda rocking movement, means for adjusting.said rod longitudinally, and a curved barbed-needle, substantially asdescribed. r 12. In a shoe sewing machine, the looper arm carried by anddepending from a hori-' zontal rod, a pair of rolls carried by acrosshead mounted loosely on said rod, a roll-arm fixed on said rod, anda spring coiled thereon connected to give both a longitudinal and arotary movement to said rod, in combination,

with cams for engaging said pair of rolls and a cam for engaging saidroll-arm, whereby the said looper-arm is caused to have a revolvingmotion in relation to the needle, substantially as described.

13. In a shoe sewing machine, the combination, with the rock-rod,mounted in fixed bearings at each end having a depending looperarmoutside of its front bearing and a depending arm between said bearings,with a cam for engaging said latter arm to vibrate the looper to theright, a feed lever device, and a cam for moving it laterally in thesame direction as the looper, the action of. said cams being timed so asto cause both the looperarm and the feed lever-device to be broughttogether at the point to make the feed and give a uniform drawing actionupon the thread, as described.

14. The combination of the centerhead and the sewing head mounted on thefront thereof, the needle carrier, the feed-device and the back-gagearranged in the sewing-head, with a rod arranged above said devices infixed bearings in the sewing-head and in the centerhead and having alooper-arm depending in front of said devices, and suitablemechanismarrauged between said fixed bearings for imparting to said rodboth a rocking and a sliding movement in the way described.

15. In a shoe sewing machine, a barbedneedle-carrier, means to actuateit, a horizontal rodmounted in fixed bearings in a plane verticallyabove the needle-carrier, a looperarm dependingfrom said rod in front ofsaid needle-carrier, a spring connected with and I coiled on said rod,fastened to a fixed frame part and acting to constantly move thelooperarm both to one side and longitudinally toward the. front, andadepending arm on said rod in rear of the needle-carrier, in combinationwith cams for moving said rod longitudinally rearward, and a camengaging said inner arm'to move the looper-arm to the other side againstthe tension of said spring, and means for adjusting said armlongitudinally to set thelooper-arm in relation to the needle,substantially as described.

16. A loop forming mechanism for sewing machines consisting essentiallyof a looperarm depending from a horizontal rod, and means for impartingto said rod a horizontal and a rocking movement simultaneously,

consisting of a spring which acts both by tension and by torsion to movethe rod to the front and to rock it in one direction, and

cams constructed to act upon said rod to both move it rearward and torockit in the opposite direction whereby the looper finger is caused todescribe a circular path.

17. In a shoe sewing machine, the combination with a curved barbedneedle, of a looper arm depending from a horizontal rock rod, andmechanism for causing the looperfinger to describe a full circular patharound the needle, consisting of cams acting on said rod to move itlongitudinally in one direction and to rock' it in one direction, and aspring which co-acts with such cams by its force upon the looper-rodacting in two directions to move it longitudinally in the opsigned thisspecification in the presenceof witnesses.

I FRANCIS ARTHUR MILLSJ Witnesses;

A. E. H. J oHNso'N, PHILIP F. LARNER.

